A retrofit luminaire assembly for mounting in an existing canopy fixture housing and methods of installing same. The method may include identifying an application for sharing by a first device, discovering one or more second devices by the first device, independent of a technology or a platform of the devices, applying communication protocols and creating an association between the first device and the one or more second devices, and determining multimedia capabilities of the one or more second devices. A plurality of split faces is generated by splitting each of the plurality of initial faces that intersects another one or more of the plurality of initial faces into two or more split faces along one or more lines of intersection. An amount of resistance of the sensor element is calculated based on a ratio between the change amounts in the current value and the voltage value. Embodiments of the disclosed probes are capable of undergoing condensationcyclization reactions with cysteine andor homocysteine.